No the Tudor Mini Sub is 33mm. The Lady Sub is 27mm. Here is a list of all of the Tudor subs sans the Lady Sub. As you can see below there were 4 different case sizes. The standard 40mm, the 35mm reduced called a Midi (and yes that is spelled correctly), the 33mm Mini Sub, and the 27mm Lady Sub.
Enjoy!
40mm
7922
7923
7924
7928
7928/0
7016
7021
9401
9401/0
9411
9411/0
94110
79090
76100
79190
35mm MIDI
76000
75090
75190
33mm MS
73090 (marked mini-sub on dial) etc is 33mm
94400 Mini-Sub 33mm w/lolipop snowflake
94401 tw0 tone
73091 two/tone
73190 white/salmon/blue/black dial, silver bezel
27mm Lady Sub
Several References